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Finding the Fourth Proportional to 158,398.56, 218,590.12 and 86,781.20

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Solution

The fourth proportional to 158,398.56, 218,590.12 and 86,781.20 is: 119,758.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,398.56 : 218,590.12 = 86,781.20 : x
  2. Step 2: Convert to fraction form
    158,398.56/218,590.12 = 86,781.20/x
  3. Step 3: Cross multiply
    158,398.56x = 218,590.12 × 86,781.20
  4. Step 4: Simplify right side
    158,398.56x = 18,969,512,921.74
  5. Step 5: Solve for x
    x = 18,969,512,921.74/158,398.56
  6. Step 6: Final answer
    x = 119,758.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.